Demodulation reference signal patterns for dynamic spectrum sharing with increased spectral efficiency for 5g or other next generation network

ABSTRACT

The disclosed subject matter is directed towards semi-static or dynamic shifting of New Radio demodulation reference signals to avoid collisions with LTE cell specific reference signals (LTE CRS) in a physical downlink shared channel symbol (PDSCH). In dynamic spread spectrum (DSS) deployments, where NR PDSCH mapping type B is used, e.g., to allow for two NR physical downlink control channel symbols, when the NR PDSCH starts on a symbol carrying LTE CRS, the NR DMRS of the NR PDSCH is shifted to the first symbol of the NR PDSCH not carrying LTE CRS. Whether mapping type A or mapping type B, shifting the symbol containing NR DMRS facilitates the use of two DMRS symbols without colliding with LTE CRS.

RELATED APPLICATION

The subject patent application is a continuation of, and claims priorityto, U.S. patent application Ser. No. 16/549,022, filed Oct. 23, 2019,and entitled “DEMODULATION REFERENCE SIGNAL PATTERNS FOR DYNAMICSPECTRUM SHARING WITH INCREASED SPECTRAL EFFICIENCY FOR 5G OR OTHER NEXTGENERATION NETWORK,” the entirety of which priority application ishereby incorporated by reference herein.

TECHNICAL FIELD

The subject application relates to wireless communications systems ingeneral, and more particularly to New Radio (NR) including fifthgeneration (5G) cellular wireless communications systems and/or othernext generation networks, in which Dynamic Spectrum Sharing (DSS) (alsoreferred to as Long Term Evolution (LTE) LTE-NR coexistence, or LNC),allows for deployment in overlapping spectrum.

BACKGROUND

When 4G LTE (Fourth Generation Long Term Evolution) and 5G NR (FifthGeneration New Radio) are deployed in partially or fully overlappingspectrum, NR signals and channels are mapped to the OrthogonalFrequency-Division Multiplexing (OFDM) time-frequency resource grid suchthat collisions with LTE signals and channels do not occur. In onealternative, NR signals are configured such that they never overlap withLTE channels and signals. Alternatively, NR channels can dynamically berate matched or punctured around Resource Elements (REs) occupied byLTE.

If a NR transmission, for example a Physical Downlink Shared Channel(PDSCH), is scheduled in a normal downlink subframe, and one or more LTECell Specific Reference Signals (CRS) punctures the PDSCH, the resourceelements carrying LTE CRS are not used for NR PDSCH. Rather, thetransmitter sends the actual LTE CRS on these resources. If a NRreceiver is made aware of the LTE-CRS configuration, the NR transmittercan map (and the NR receiver, aware of the LTE CRS configuration, candemap) the NR PDSCH around resources reserved for LTE-CRS. This isreferred to as rate matching, because removing the resource elements forLTE-CRS from the NR PDSCH transmission changes the code rate, which isnow matched to take into account the LTE-CRS transmission.

In PDSCH mapping type A, the first symbol carrying demodulationreference signals (DMRS) for demodulating the NR PDSCH is transmitted ona fixed symbol informed to the UE by the MasterinformationBlock (MIB)payload transmitted in the Physical Broadcast Channel (PBCH). For PDSCHmapping type A, the DMRS can be configured to be transmitted on eitherthe third or fourth OFDM symbol, depending on the number of LTE CRSantenna ports and the NR PDCCH (physical downlink control channel) span,that is, the number of OFDM symbols carrying NR PDCCH. Alternatively,PDSCH mapping type B can be used for NR PDSCH transmissions. PDSCHmapping type A and B differ in that unlike with PDSCH mapping type A,where the position of the PDSCH DMRS is fixed and signaled in the MIB,with PDSCH mapping type B the PDSCH DMRS position is always the firstsymbol of the actual NR PDSCH transmission.

Because NR PDCCH occupies the symbols between two consecutive symbolscarrying LTE CRS (third and fourth OFDM symbol) and because NR DMRScannot collide with LTE CRS, using two NR PDCCH control symbols inLNC/DSS with PDSCH mapping type B accordingly means leaving the fifthsymbol empty (other than for the LTE-CRS), which is inefficient. Thisdoes not happen with NR PDSCH mapping type A where all but the first twosymbols are used for NR transmissions. However, the drawback of usingPDSCH mapping type A is that at most one symbol can be used for NR PDCCHbecause PDSCH mapping type A cannot be scheduled with a PDCCH after thethird symbol. Limiting the NR PDCCH to one symbol is extremelychallenging when the bandwidth of the NR carrier matches that of the LTEcarrier and is only 5 or 10 MHz, whereby at most Aggregation Level (AL)8 can be used for NR PDCCH, which can adversely impact NR PDCCHrobustness and coverage. Moreover, multiplexing multiple NR PDCCH intoone symbol is very challenging given the limited overall NR PDCCHcontrol resources. Hence, deployments that allow for up to two NR PDCCHsymbols (twice the capacity as compared to one symbol) are advantageous.Such deployments, however, need to use PDSCH mapping type B, as PDSCHmapping type A has to be scheduled from the first three symbols.

BRIEF DESCRIPTION OF THE DRAWINGS

Non-limiting and non-exhaustive embodiments of the subject disclosureare described with reference to the following figures, wherein likereference numerals refer to like parts throughout the various viewsunless otherwise specified.

FIG. 1 illustrates an example wireless communication system showingcommunications from a network device to a user equipment, in accordancewith various aspects and embodiments of the subject disclosure.

FIG. 2 illustrates an example timing diagram showing communicationsbetween a base station and a mobile station device, in accordance withvarious aspects and embodiments of the subject disclosure.

FIG. 3 is an example representation of OFDM symbols in whichdemodulation reference signals in a PDSCH symbol can be configured to ordynamically shifted to avoid collision with LTE cell-specific referencesignals, in accordance with various aspects and embodiments of thesubject disclosure.

FIG. 4 is an example representation of OFDM symbols in which twoconsecutive demodulation reference signals in PDSCH symbols aredynamically shifted to avoid collision with LTE cell-specific referencesignals, in accordance with various aspects and embodiments of thesubject disclosure.

FIG. 5 is an example representation of OFDM symbols in which twoseparate demodulation reference signals in a PDSCH symbols aredynamically shifted to avoid collision with LTE cell-specific referencesignals, in accordance with various aspects and embodiments of thesubject disclosure.

FIG. 6 is an example representation of OFDM symbols in which a secondgroup of demodulation reference signals in a PDSCH symbol is dynamicallyshifted to avoid collision with LTE cell-specific reference signals, inaccordance with various aspects and embodiments of the subjectdisclosure.

FIG. 7 is a flow diagram representing example operations related todynamic shifting of demodulation reference signals contained in a PDSCHsymbol, in accordance with various aspects and embodiments of thesubject disclosure.

FIG. 8 illustrates example operations of a user equipment device toevaluate configuration information to determine whether demodulationreference signals contained in a PDSCH symbol have been shifted to alater PDSCH symbol, in accordance with various aspects and embodimentsof the subject disclosure.

FIG. 9 illustrates example operations of a wireless network device toconfigure a user equipment with information that can be used to indicatethat demodulation reference signals contained in a PDSCH symbol havebeen shifted to a later PDSCH symbol, in accordance with various aspectsand embodiments of the subject disclosure.

FIG. 10 illustrates example operations of a user equipment device toevaluate configuration information to determine whether demodulationreference signals contained in a PDSCH symbol are shifted to a laterPDSCH symbol to avoid collision with LTE cell specific referencesignals, in accordance with various aspects and embodiments of thesubject disclosure.

FIG. 11 illustrates an example block diagram of an example mobilehandset operable to engage in a system architecture that facilitateswireless communications according to one or more embodiments describedherein.

FIG. 12 illustrates an example block diagram of an examplecomputer/machine system operable to engage in a system architecture thatfacilitates wireless communications according to one or more embodimentsdescribed herein.

DETAILED DESCRIPTION

The technology described herein is generally directed towards avoidingcollisions between LTE CRS (cell specific reference signals) and DMRS(demodulation reference signals) in LNC/DSS (LTE-NR coexistence/DynamicSpectrum Sharing) deployments, by shifting the DMRS to a later (later insymbol order) PDSCH (physical downlink shared channel) OFDM symbol whenLTE-CRS is present in a PDSCH symbol. Among other benefits, this allowsa PDSCH symbol containing LTE-CRS to include NR downlink data in theLTE-CRS symbol's subcarriers (other than those containing LTE-CRS),rather than leaving the symbol otherwise empty, including when twosymbols are used for physical downlink control channel (PDCCH) data inmapping type B.

In general, to avoid an LTE-CRS and DMRS collision when such a collisioncould occur based on the rate matching pattern, the base station deviceshifts the DMRS to a later symbol. Based on the LTE-CRS rate matchingconfiguration information sent to a user equipment, the user equipmentrecognizes when an LTE-CRS and DMRS collision would have otherwiseoccurred, and thereby knows that the DMRS have been shifted to another(e.g., next) PDSCH symbol.

Where NR PDSCH mapping type B is used, e.g., to allow for two NR PDCCHsymbols, and when the NR PDSCH starts on a symbol carrying LTE CRS, theNR DMRS of the NR PDSCH is shifted to the first symbol of the NR PDSCHnot carrying LTE CRS in order to avoid a collision of LTE CRS with NRDMRS. The same procedure may be applied to NR DMRS that is notconfigured at the beginning of an NR PDSCH allocation. When NR DMRS thatare not at the beginning of the corresponding NR PDSCH allocation wouldotherwise collide with LTE CRS, the NR DMRS can be shifted to avoid sucha collision.

The technology thus allows using up to all NR OFDM symbols (except thefirst two of a slot) when NR PDCCH is transmitted outside the firstthree OFDM symbols of a slot using NR PDSCH mapping type B, whereby NRDMRS is not sent on the first OFDM symbol of the NR PDSCH resourceallocation containing LTE CRS and furthermore, sending NR DMRS on thesecond OFDM symbol of the NR PDSCH resource allocation. Further,regardless of whether a NR PDSCH resource allocation is of PDSCH mappingtype A or B, two consecutive OFDM symbols may be configured to carry NRDMRS. Again, when LTE CRS may collide with NR DMRS on the second of thetwo symbols carrying NR DMRS, shifting of the DMRS is performed to avoidthe collision.

One or more embodiments are now described with reference to thedrawings, wherein like reference numerals are used to refer to likeelements throughout. In the following description, for purposes ofexplanation, numerous specific details are set forth in order to providea thorough understanding of the various embodiments. It is evident,however, that the various embodiments can be practiced without thesespecific details (and without applying to any particular networkedenvironment or standard).

As used in this disclosure, in some embodiments, the terms “component,”“system” and the like are intended to refer to, or comprise, acomputer-related entity or an entity related to an operational apparatuswith one or more specific functionalities, wherein the entity can beeither hardware, a combination of hardware and software, software, orsoftware in execution. As an example, a component may be, but is notlimited to being, a process running on a processor, a processor, anobject, an executable, a thread of execution, computer-executableinstructions, a program, and/or a computer. By way of illustration andnot limitation, both an application running on a server and the servercan be a component.

One or more components may reside within a process and/or thread ofexecution and a component may be localized on one computer and/ordistributed between two or more computers. In addition, these componentscan execute from various computer readable media having various datastructures stored thereon. The components may communicate via localand/or remote processes such as in accordance with a signal having oneor more data packets (e.g., data from one component interacting withanother component in a local system, distributed system, and/or across anetwork such as the Internet with other systems via the signal). Asanother example, a component can be an apparatus with specificfunctionality provided by mechanical parts operated by electric orelectronic circuitry, which is operated by a software application orfirmware application executed by a processor, wherein the processor canbe internal or external to the apparatus and executes at least a part ofthe software or firmware application. As yet another example, acomponent can be an apparatus that provides specific functionalitythrough electronic components without mechanical parts, the electroniccomponents can comprise a processor therein to execute software orfirmware that confers at least in part the functionality of theelectronic components. While various components have been illustrated asseparate components, it will be appreciated that multiple components canbe implemented as a single component, or a single component can beimplemented as multiple components, without departing from exampleembodiments.

Further, the various embodiments can be implemented as a method,apparatus or article of manufacture using standard programming and/orengineering techniques to produce software, firmware, hardware or anycombination thereof to control a computer to implement the disclosedsubject matter. The term “article of manufacture” as used herein isintended to encompass a computer program accessible from anycomputer-readable (or machine-readable) device or computer-readable (ormachine-readable) storage/communications media. For example, computerreadable storage media can comprise, but are not limited to, magneticstorage devices (e.g., hard disk, floppy disk, magnetic strips), opticaldisks (e.g., compact disk (CD), digital versatile disk (DVD)), smartcards, and flash memory devices (e.g., card, stick, key drive). Ofcourse, those skilled in the art will recognize many modifications canbe made to this configuration without departing from the scope or spiritof the various embodiments.

Moreover, terms such as “mobile device equipment,” “mobile station,”“mobile,” subscriber station,” “access terminal,” “terminal,” “handset,”“communication device,” “mobile device” (and/or terms representingsimilar terminology) can refer to a wireless device utilized by asubscriber or mobile device of a wireless communication service toreceive or convey data, control, voice, video, sound, gaming orsubstantially any data-stream or signaling-stream. The foregoing termsare utilized interchangeably herein and with reference to the relateddrawings. Likewise, the terms “access point (AP),” “Base Station (BS),”BS transceiver, BS device, cell site, cell site device, “gNode B (gNB),”“evolved Node B (eNode B),” “home Node B (HNB)” and the like, areutilized interchangeably in the application, and refer to a wirelessnetwork component or appliance that transmits and/or receives data,control, voice, video, sound, gaming or substantially any data-stream orsignaling-stream from one or more subscriber stations. Data andsignaling streams can be packetized or frame-based flows.

Furthermore, the terms “device,” “communication device,” “mobiledevice,” “subscriber,” “customer entity,” “consumer,” “customer entity,”“entity” and the like are employed interchangeably throughout, unlesscontext warrants particular distinctions among the terms. It should beappreciated that such terms can refer to human entities or automatedcomponents supported through artificial intelligence (e.g., a capacityto make inference based on complex mathematical formalisms), which canprovide simulated vision, sound recognition and so forth.

Embodiments described herein can be exploited in substantially anywireless communication technology, comprising, but not limited to,wireless fidelity (Wi-Fi), global system for mobile communications(GSM), universal mobile telecommunications system (UMTS), worldwideinteroperability for microwave access (WiMAX), enhanced general packetradio service (enhanced GPRS), third generation partnership project(3GPP) long term evolution (LTE), third generation partnership project 2(3GPP2) ultra mobile broadband (UMB), high speed packet access (HSPA),Z-Wave, Zigbee and other 802.11 wireless technologies and/or legacytelecommunication technologies.

As shown in FIG. 1 , a network device 102 such as base stationconfigures a user equipment 104 for downlink communications. Asdescribed herein, for dynamic spectrum sharing, the network device 102transmits LTE rate matching pattern configuration information 106 to theUE 104. As further described herein, the network device 102 transmitsdownlink DMRS configuration information 108, control channel information110 and the PDSCH symbols, including at least one PDSCH symbol 104 thatcarries the DMRS 112.

More particularly, in order for the user equipment (NR receiver) to beable to rate match around the LTE CRS resources, the LTE CRSconfiguration is provide, which can be done via the Radio ResourceControl (RRC) protocol which contains the RateMatchPatternLTE-CRSInformation Element (IE) informing the NR receiver about the LTE carrierfrequency, carrier bandwidth, Multimedia Broadcast multicast serviceSingle Frequency Network (MBSFN) subframe configuration, number of LTECRS antenna ports and v-shift (described below). Note that differentcell-specific reference signal (CRS) patterns can be provided for one,two, and four LTE CRS antenna ports. These LTE reference signals arepresent in LTE subframes (set of 14 OFDM symbols spanning 1 ms for 15kHz OFDM subcarrier spacing), with different densities depending onwhether an LTE subframe is configured as normal downlink or MBSFNsubframe.

The LTE carrier frequency and bandwidth are informed to the NR UE incase LTE and NR carriers are partially, rather than fully overlapping.Knowledge of the MBSFN subframe configuration is needed because, asmentioned above, the LTE CRS density differs between normal and MBSFNsubframes and hence, the rate matching procedure has to account fordifferent LTE CRS patterns depending on whether the NR PDSCH istransmitted in a normal or a MBSFN subframe.

Because the LTE CRS density also differs for {1,2,4} LTE CRS antennaports, this information is conveyed to the NR UE together withinformation on the v-shift which allows to shift the patterns by zero,one or two subcarriers in frequency domain to avoid collisions of LTECRS transmissions by neighboring base stations.

In one known solution, LTE or DSS can be deployed using one of twoconfigurations. In a first configuration, for four LTE CRS antennaports, the NR Physical Downlink Control Channel (PDCCH) is transmittedon the third OFDM symbol, and on the second and third symbol for one ortwo LTE CRS antenna ports. The NR PDSCH, in this configuration, istransmitted using PDSCH mapping type A whereby the first symbol carryingDMRS for demodulating the NR PDSCH is transmitted on a fixed symbolinformed to the UE by the MasterinformationBlock (MIB) payloadtransmitted in the Physical Broadcast Channel (PBCH). For PDSCH mappingtype A, the DMRS can be configured to either be transmitted on the thirdor fourth OFDM symbol depending on the number of LTE CRS antenna portsand the NR PDCCH span, i.e., the number of OFDM symbols carrying NRPDCCH.

In one configuration, the first two OFDM symbols are reserved for LTECRS (NR PDCCH transmissions cannot be rate matched around LTE CRS). Thethird OFDM symbol carries the control information NR PDCCH (withoutspecial UE support, the NR PDCCH can span at most three symbols at thebeginning of a subframe/slot); because the third symbol carriers NRPDCCH, the DMRS is configured to be transmitted on the fourth symbol. NRPDSCH uses resources starting with the fourth symbol (carrying the DMRS)until the end of the subframe/slot. (A NR slot comprises 14 OFDM symbolsand a NR subframe is fixed to 1 ms duration. At 15 kHz subcarrierspacing, the same subcarrier spacing as for LTE, the duration of a NRslot coincides with that of a subframe.)

Alternatively, PDSCH mapping type B can be used for NR PDSCHtransmissions. PDSCH mapping type A and B differ in that unlike withPDSCH mapping type A, where the position of the PDSCH DMRS is fixed andsignaled in the MIB, with PDSCH mapping type B the PDSCH DMRS positionis always the first symbol of the actual NR PDSCH transmission. In oneknown solution, the first two OFDM symbols are reserved for LTE CRS, thethird and fourth OFDM symbol carry NR PDCCH, and the fifth symbol isreserved because LTE CRS and DMRS are not allowed to collide by 5G NRspecifications. Thus, the NR PDSCH starts on the sixth symbol, whichcarries the corresponding DMRS

Because the PDSCH can be scheduled to start on any OFDM symbol withPDSCH mapping type B, the corresponding DMRS can be on any symbolbecause according to NR specifications, for PDSCH mapping type B theDMRS is carried on the first symbol of the actual NR PDSCH. It is notedthat additional OFDM symbols can be configured for DMRS, e.g., toimprove performance in high-speed scenarios.

It is also noted that the PDCCH configuration for mapping type Brequires special UE support, in that basic NR UEs only support a PDCCHspan of up to three OFDM symbols at the beginning of a slot. In otherwords, NR PDCCH can be transmitted on any or all of the first three OFDMsymbols, but no PDCCH resources can span beyond the third OFDM symbol,e.g., the fourth OFDM symbol.

However, as an optional UE capability, the NR PDCCH span of up to threeOFDM symbols can be shifted to the right to not commence at the slotboundary allowing NR PDCCH transmissions on any or all OFDM symbols of asingle span of three OFDM symbols anywhere in a slot. For LNC/DSS, thisallows to shift NR PDCCH resources to commence after the LTE CRS at thebeginning of a slot, e.g., after the first symbol for one or two LTE CRSantenna ports and after the second symbol for four LTE CRS antennaports, such as where the NR PDCCH span starts on the third symbol andgoes beyond the third symbol including the fourth symbol thereby mappingthe NR PDCCH on all symbols not carrying LTE CRS between two consecutivesymbols carrying LTE CRS. Because NR PDSCH mapping type A cannot bescheduled using a PDCCH that occupies resources after the third symbol,such a configuration requires usage of PDSCH mapping type B.

Thus, in known solutions, because LTE CRS and NR DMRS are not allowed tocollide, the fifth OFDM symbol has to be left empty. This does nothappen with NR PDSCH mapping type A where all but the first two symbolsare used for NR transmissions, however at most one symbol can be usedfor NR PDCCH because PDSCH mapping type A cannot be scheduled with aPDCCH after the third symbol.

In contrast to the known solutions, the technology described hereinfacilitates using two NR PDCCH control symbols in LNC/DSS with PDSCHmapping type B, without leaving the fifth symbol empty (for use withLTE-CRS). The technology described herein allows mapping NR PDSCH ontothe fifth symbol whereby the fifth symbol is the first symbol of a NRPDSCH according to PDSCH mapping type B. To this end, in LNC/DSSdeployments, where NR PDSCH mapping type B is used, e.g., to allow fortwo NR PDCCH symbols, and when the NR PDSCH starts on a symbol carryingLTE CRS, the NR DMRS of said NR PDSCH is shifted (e.g., to the firstsymbol of the NR PDSCH not carrying LTE CRS) in order to avoid collisionof LTE CRS with NR DMRS. In addition, the same procedure may be appliedto NR DMRS that is not configured at the beginning of an NR PDSCHallocation. When NR DMRS not at the beginning of the corresponding NRPDSCH allocation would otherwise collide with LTE CRS, the NR DMRS canbe shifted to avoid such a collision.

The technology described herein thus allows the use of up to all NR OFDMsymbols (except the first two of a slot) when NR PDCCH is transmittedoutside the first three OFDM symbols of a slot using NR PDSCH mappingtype B whereby NR DMRS is not sent on the first OFDM symbol of the NRPDSCH resource allocation containing LTE CRS and furthermore, sending NRDMRS on the second OFDM symbol of the NR PDSCH resource allocation.Further, with mapping type A, multiple PDSCH symbols with DMRS can beused without LTE-CRS collisions.

FIG. 2 depicts communications in an exemplary wireless communicationssystem 200, which can be the same as or similar to the system 100 ofFIG. 1 . Mobile station device 211 first receives synchronization signalinformation 220 from base station device 210 to obtain coarse time andfrequency synchronization for reception of the broadcast channel 221transmitted by base station device 210. The payload of the broadcastchannel transmission 221 enables mobile station device 211 to receiveremaining system information (RMSI) scheduled by physical downlinkcontrol channel (PDCCH) transmission 222 and transmitted by the physicaldownlink shared channel (PDSCH) transmission 223. The payload of 223,namely, parts of the RMSI, enable mobile station device 211 to initiatea random access procedure by transmitting a physical random accesschannel transmission 224 to base station device 210. Base station device210 responds to the physical random access channel transmission 224 witha random access response (RAR) scheduled by physical downlink controlchannel (PDCCH) transmission 225 and transmitted by the physicaldownlink shared channel (PDSCH) transmission 226. Amongst others, therandom access response includes information for mobile station device211 to transmit message 3 (Msg.3) on the physical uplink shared channel(PUSCH) transmission 227. Physical downlink shared channel (PDSCH)transmission 231 scheduled by physical downlink control channel (PDCCH)transmission 230 may serve the purpose of contention resolution, ifnecessary. After contention resolution, one or more PDCCH 240 and PDSCH241 transmissions may configure the mobile station device 211 forLNC/DSS. Subsequently, PDSCH transmissions 251 scheduled by PDCCHtransmissions 250 use the embodiments herein.

For ease of exposition, but without limiting any embodiments, FIGS. 3-6depict LTE DL subframes with the highest LTE CRS density. Note that inFIGS. 3-6 , an unshaded, unlabeled block indicates zero-power resource,a shaded block labeled L represents LTE-CRS, an unshaded block labeled Crepresents control channel information (NR-PDCCH), a hatched blocklabeled D represents NR PDSCH DMRS, and an unshaded block labeled Srepresents NR-PDSCH containing downlink data in general.

In one embodiment, the mobile station device 111 can be semi-staticallyconfigured by RRC to always transmit DMRS on the second symbol of a NRPDSCH with PDSCH mapping type B. As a result, the first NR PDSCH symbol(the fifth symbol/column in FIG. 3 ) is able to contain the LTE-CRS,with no possible collision, (as the sixth symbol in FIG. 3 contains theDMRS as a result of the semi-static configuration).

In another embodiment of the technology described herein, the mobilestation device 111 dynamically switches the DMRS position for PDSCHmapping type B depending on whether the first symbol of the NR PDSCHresource allocation contains LTE CRS. As described herein, the NR UE isaware of the LTE CRS rate matching configuration via theRateMatchPatternLTE-CRS information element of the NR RRC protocol. TheNR PDCCH dynamically allocates NR PDSCH resources with PDSCH mappingtype B to the UE. The Downlink Control Information (DCI) in the PDCCHtogether with the LTE CRS rate matching configuration, e.g.,RateMatchPatternLTE-CRS of the RRC protocol, is used by the NR receiverto determine whether the first symbol of the NR PDSCH resourceallocation contains LTE CRS.

If the first symbol of the NR PDSCH resource allocation does not containLTE CRS, NR DMRS is transmitted on the first symbol, according to priorsolutions. If instead the first symbol of the NR PDSCH resourceallocation does contain LTE CRS, the NR DMRS is dynamically shifted tothe second OFDM symbol as exemplified by the curved arrow labeled 333 inFIG. 3 . Note that FIG. 3 represents both the semi-static configurationand a dynamically shifted configuration; the dynamic shift embodiment isemphasized by the curved arrow 333.

Note that a DMRS configuration may comprise NR DMRS on more than oneconsecutive OFDM symbol. For example, NR DMRS may be configured on thefirst two OFDM symbols of a NR PDSCH resource allocation of PDSCHmapping type B. In this case, if the UE determines that LTE CRS istransmitted on the first symbol of the NR PDSCH resource allocation ofPDSCH mapping type B as in FIG. 4 , both symbols carrying NR DMRS areshifted. For example, if as in FIG. 4 the NR DMRS that normally istransmitted on the first symbol of the NR PDSCH resource allocation ofPDSCH mapping type B is shifted (curved arrow 443) to the second symbolof the NR PDSCH resource allocation of PDSCH mapping type B and the NRDMRS that normally is transmitted on the second symbol of the NR PDSCHresource allocation of PDSCH mapping type B is shifted (curved arrow444) to the third symbol of the NR PDSCH resource allocation of PDSCHmapping type B.

Aspects of the embodiments herein may also be applied to NR DMRS symbolsthat are not at the beginning of a slot, as illustrated in the exampleof FIG. 5 . In this example, NR DMRS is also configured to betransmitted on the eighth symbol of a NR PDSCH resource allocation ofPDSCH mapping type B. If, however, the DCI scheduling the NR PDSCH inconjunction with the LTE CRS rate matching information determine thatthe eighth symbol of a NR PDSCH resource allocation contains LTE CRS,the NR DMRS is dynamically shifted (curved arrow 555) to the ninthsymbol.

In yet another embodiment of the technology described herein, regardlessof whether a NR PDSCH resource allocation is of PDSCH mapping type A orB, two consecutive OFDM symbols may be configured to carry NR DMRS. Forexample, the fourth and fifth OFDM symbol of a slot may be configuredfor NR DMRS transmissions when PDSCH mapping type A is used, or thefirst two symbols of a NR PDSCH resource allocation of PDSCH mappingtype B may be configured for NR DMRS transmissions. In either case, LTECRS could collide with NR DMRS on the second of the two symbols carryingNR DMRS. In such a situation, the first of the two OFDM symbols with NRDMRS remains unchanged, and the NR DMRS that otherwise would have beentransmitted on the second OFDM symbol with NR DMRS (e.g., the fifth OFDMsymbol of a slot when PDSCH mapping type A is used, or the second OFDMsymbol of a NR PDSCH resource allocation of PDSCH mapping type B) isshifted by one OFDM symbol to avoid collision with LTE CRS.

An example illustration of this embodiment for PDSCH mapping type A isshown in FIG. 6 . As can be seen, via the shift (arrow 633), NR DMRS iscarried, for example, on the fourth and sixth OFDM symbol of a slot.Note that for PDSCH mapping type B, NR DMRS is carried on the first andthird OFDM symbol of the corresponding NR PDSCH resource allocation.

FIG. 7 is a flow diagram showing example operations of a network devicesuch as the base station 210 of FIG. 2 , beginning at operation 702where the base station 210 transmits data to configure the UE (e.g.,mobile station 211) with a first configuration comprising a pattern torate match around LTE CRS. Operation 706 transmits data to configure theUE with a second configuration comprising the downlink demodulationreference signal configuration for PDSCH. Operation 706 transmitsdownlink control information for the scheduling of a PDSCH comprisinginformation on how to map PDSCH DMRS to physical resources according tothe second configuration.

Operation 708 represents determining whether mapping of PDSCH DMRS tophysical resources would result in a collision with LTE CRS according tothe LTE CRS rate matching pattern. If there would be a collision(operation 710), the process branches to operation 712 which performsthe DMRS symbol shifting with respect to mapping PDSCH DMRS to physicalresources according to the second configuration and the downlink controlinformation. For example, the position(s) of the DMRS symbols can beincremented/shifted such that the first DMRS symbol occurs directlyafter the symbol carrying LTE CRS.

If there would not be a collision, then operation 714 represents thenon-shifting situation, that is, maps PDSCH DMRS to physical resourcesaccording to the second configuration and the downlink controlinformation without symbol shifting of the DMRS PDSCH.

Operation 716 transmits the PDSCH, including the PDSCH containing theDMRS.

One or more example aspects are represented in FIG. 8 , and cancorrespond to a user equipment device, comprising a processor, and amemory that stores executable instructions that, when executed by theprocessor, facilitate performance of operations. Example operation 802represents receiving, from a base station device, rate matchingconfiguration information comprising a pattern to rate match withrespect to long term evolution cell specific reference signals. Exampleoperation 804 represents receiving, from the base station device,downlink demodulation reference signal configuration information forphysical downlink shared channel symbols. Example operation 806represents receiving, from the base station device, downlink controlinformation that schedules a physical downlink shared channel symbol ofthe physical downlink shared channel symbols. Example operation 808represents evaluating, based on the rate matching configurationinformation, whether the physical downlink shared channel symbolcontains at least one signal of the long term evolution cell specificreference signals. Example operation 810 represents, in response todetermining that the physical downlink shared channel symbol containsthe at least one signal of the long term evolution cell specificreference signals, determining that demodulation reference signals areto be shifted to a later physical downlink shared channel symbol of thephysical downlink shared channel symbols that is later in symbol orderthan the physical downlink shared channel symbol.

The physical downlink shared channel symbol can be a first physicaldownlink shared channel symbol, and the later physical downlink sharedchannel symbol can be a second physical downlink shared channel symbolthat is directly after the first physical downlink shared channelsymbol.

Further operations can comprise mapping the demodulation referencesignals to physical resources according to the downlink demodulationreference signal configuration information and the downlink controlinformation.

Further operations can comprise, in response to determining that thephysical downlink shared channel symbol does not contain the at leastone signal of the long term evolution cell specific reference signals,determining that the demodulation reference signals are present in thephysical downlink shared channel symbol.

Further operations can comprise mapping the demodulation referencesignals to physical resources according to the downlink demodulationreference signal configuration information and the downlink controlinformation.

The demodulation reference signals can be second demodulation referencesignals, the physical downlink shared channel symbol can be a secondphysical downlink shared channel symbol, the later physical downlinkshared channel symbol can be a third physical downlink shared channelsymbol, and further operations can comprise determining from the ratematching configuration information that first demodulation referencesignals are transmitted in a first physical downlink shared channelsymbol that is different from the second physical downlink sharedchannel symbol and the third physical downlink shared channel symbol.

The third physical downlink shared channel symbol can be directly afterthe second physical downlink shared channel symbol.

The long term evolution cell specific reference signals can be firstlong term evolution cell specific reference signals, the demodulationreference signals can be first demodulation reference signals, thephysical downlink shared channel symbol can be a first physical downlinkshared channel symbol, the later physical downlink shared channel symbolcan be a second physical downlink shared channel symbol, and furtheroperations can comprise determining, from the rate matchingconfiguration information, that second long term evolution cell specificreference signals are transmitted in a third physical downlink sharedchannel symbol, and that the second demodulation reference signals areshifted to a fourth physical downlink shared channel symbol.

The demodulation reference signals can be first demodulation referencesignals, the physical downlink shared channel symbol can be a firstphysical downlink shared channel symbol, the later physical downlinkshared channel symbol can be a second physical downlink shared channelsymbol, and further operations can comprise, determining, from the ratematching configuration information, that second demodulation referencesignals are transmitted in a third physical downlink shared channelsymbol.

One or more example aspects are represented in FIG. 9 , and cancorrespond to a wireless network device, comprising a processor, and amemory that stores executable instructions that, when executed by theprocessor, facilitate performance of operations. Example operation 902represents configuring a user equipment device with first informationthat indicates that long term evolution cell specific reference signalsand first downlink data are to be received via a first physical downlinkshared channel symbol. Operation 904 represents configuring the userequipment device with second information that indicates thatdemodulation reference signals and second downlink data are to bereceived via a second physical downlink shared channel symbol that isafter the first physical downlink shared channel symbol.

Configuring the user equipment device with the second information cancomprise semi-statically configuring the user equipment with data thatindicates that the demodulation reference signals are to be received viathe second symbol of a new radio physical downlink shared channel withphysical downlink shared channel mapping type B.

The first information can comprise a pattern to rate match around longterm evolution cell specific reference signals, the second informationcan comprise a downlink demodulation reference signal configuration forphysical downlink shared channel mapping type B, and further operationscan comprise, transmitting downlink control information for schedulingof a physical downlink shared channel symbol that contains the long termevolution cell specific reference signals and the first downlink data,and shifting the demodulation reference signals and second downlink datato the second physical downlink shared channel symbol that is after thefirst physical downlink shared channel symbol.

The second physical downlink shared channel symbol can be directly afterthe first physical downlink shared channel symbol.

The first information can comprise a pattern to rate match around longterm evolution cell specific reference signals, the second informationcan comprise a downlink demodulation reference signal configuration forphysical downlink shared channel mapping type B that indicates that twoconsecutive groups of demodulation reference signal are to betransmitted, and further operations can comprise, transmitting downlinkcontrol information for scheduling of a first physical downlink sharedchannel symbol that contains the long term evolution cell specificreference signals and the first downlink data, shifting a first group ofthe demodulation reference signals and second downlink data to thesecond physical downlink shared channel symbol that is after the firstphysical downlink shared channel symbol, and shifting a second group ofdemodulation reference signals and third downlink data to a thirdphysical downlink shared channel symbol that is after the secondphysical downlink shared channel symbol.

The demodulation reference signals can be first demodulation referencesignals, and the second information can further indicate that seconddemodulation reference signals are to be received via a third physicaldownlink shared channel symbol that is later than the first physicaldownlink shared channel symbol.

The demodulation reference signals can be second demodulation referencesignals, and the second information can further indicate that firstdemodulation reference signals are to be received via a third physicaldownlink shared channel symbol that is before the first physicaldownlink shared channel symbol.

One or more aspects, such as implemented in a machine-readable storagemedium, comprising executable instructions that, when executed by aprocessor, facilitate performance of example operations, are representedin FIG. 10 . Operation 1002 represents receiving, from a wirelessnetwork device, rate matching configuration information to rate matchwith respect to long term evolution cell specific reference signals, anddownlink demodulation reference signal configuration information.Operation 1004 represents receiving downlink control information fromthe wireless network device. Operation 1006 represents decoding thedownlink control information to determine start and length (e.g., onesymbol) information for a physical downlink shared channel. Operation1008 represents evaluating the rate matching configuration informationto determine whether the physical downlink shared channel symbolcontains demodulation reference signals or whether the physical downlinkshared channel symbol contains the long term evolution cell specificreference signals indicating that the demodulation reference signalshave been shifted to a next physical downlink shared channel symbol.

Evaluating the rate matching configuration information further cancomprise determining whether the wireless network device transmits otherdemodulation reference signals in another physical downlink sharedchannel symbol.

Evaluating the rate matching configuration information can determinethat the physical downlink shared channel symbol contains the long termevolution cell specific reference signals in a first group ofsubcarriers of the physical downlink shared channel symbol; furtheroperations can comprise obtaining downlink data from a second group ofsubcarriers of the physical downlink shared channel symbol.

The demodulation reference signals can be first demodulation referencesignals, the downlink control information can be received via a singlephysical downlink control channel symbol, and can be the evaluating therate matching configuration information further can comprise determiningthat a physical downlink shared channel symbol contains the firstdemodulation reference signals, that a second physical downlink sharedchannel after the first physical downlink shared channel symbol containsthe long term evolution cell specific reference signals, and that athird physical downlink shared channel symbol after the second physicaldownlink shared channel symbol contains second demodulation referencesignals.

As can be seen, the technology described herein facilitates the use ofup to all NR OFDM symbols (except the first two of a slot), includingwhen NR PDCCH is transmitted outside the first three OFDM symbols of aslot using NR PDSCH mapping type B, which provides increased spectralefficiency. Shifting of the NR DMRS can be dynamic, whereby NR DMRS neednot be sent on the first OFDM symbol of the NR PDSCH resourceallocation, such that the first PDSCH symbol can contain LTE CRS. Morethan one PDSCH symbol can contain NR DMRS, with shifting taking place toavoid LTE CRS collisions.

A wireless communication system can employ various cellular systems,technologies, and modulation schemes to facilitate wireless radiocommunications between devices (e.g., a UE and the network device).While example embodiments might be described for 5G new radio (NR)systems, the embodiments can be applicable to any radio accesstechnology (RAT) or multi-RAT system where the UE operates usingmultiple carriers e.g., LTE FDD/TDD, GSM/GERAN, CDMA2000 etc. Forexample, the system can operate in accordance with global system formobile communications (GSM), universal mobile telecommunications service(UMTS), long term evolution (LTE), LTE frequency division duplexing (LTEFDD, LTE time division duplexing (TDD), high speed packet access (HSPA),code division multiple access (CDMA), wideband CDMA (WCMDA), CDMA2000,time division multiple access (TDMA), frequency division multiple access(FDMA), multi-carrier code division multiple access (MC-CDMA),single-carrier code division multiple access (SC-CDMA), single-carrierFDMA (SC-FDMA), orthogonal frequency division multiplexing (OFDM),discrete Fourier transform spread OFDM (DFT-spread OFDM) single carrierFDMA (SC-FDMA), Filter bank based multi-carrier (FBMC), zero tailDFT-spread-OFDM (ZT DFT-s-OFDM), generalized frequency divisionmultiplexing (GFDM), fixed mobile convergence (FMC), universal fixedmobile convergence (UFMC), unique word OFDM (UW-OFDM), unique wordDFT-spread OFDM (UW DFT-Spread-OFDM), cyclic prefix OFDM CP-OFDM,resource-block-filtered OFDM, Wi Fi, WLAN, WiMax, and the like. However,various features and functionalities of system are particularlydescribed wherein the devices (e.g., the UEs and the network device) ofthe system are configured to communicate wireless signals using one ormore multi carrier modulation schemes, wherein data symbols can betransmitted simultaneously over multiple frequency subcarriers (e.g.,OFDM, CP-OFDM, DFT-spread OFDM, UFMC, FMBC, etc.). The embodiments areapplicable to single carrier as well as to multicarrier (MC) or carrieraggregation (CA) operation of the UE. The term carrier aggregation (CA)is also called (e.g., interchangeably called) “multi-carrier system”,“multi-cell operation”, “multi-carrier operation”, “multi-carrier”transmission and/or reception. Note that some embodiments are alsoapplicable for Multi RAB (radio bearers) on some carriers (that is dataplus speech is simultaneously scheduled).

In various embodiments, the system can be configured to provide andemploy 5G wireless networking features and functionalities. With 5Gnetworks that may use waveforms that split the bandwidth into severalsub-bands, different types of services can be accommodated in differentsub-bands with the most suitable waveform and numerology, leading toimproved spectrum utilization for 5G networks. Notwithstanding, in themmWave spectrum, the millimeter waves have shorter wavelengths relativeto other communications waves, whereby mmWave signals can experiencesevere path loss, penetration loss, and fading. However, the shorterwavelength at mmWave frequencies also allows more antennas to be packedin the same physical dimension, which allows for large-scale spatialmultiplexing and highly directional beamforming.

Performance can be improved if both the transmitter and the receiver areequipped with multiple antennas. Multi-antenna techniques cansignificantly increase the data rates and reliability of a wirelesscommunication system. The use of multiple input multiple output (MIMO)techniques, which was introduced in the third-generation partnershipproject (3GPP) and has been in use (including with LTE), is amulti-antenna technique that can improve the spectral efficiency oftransmissions, thereby significantly boosting the overall data carryingcapacity of wireless systems. The use of multiple-input multiple-output(MIMO) techniques can improve mmWave communications; MIMO can be usedfor achieving diversity gain, spatial multiplexing gain and beamforminggain.

Note that using multi-antennas does not always mean that MIMO is beingused. For example, a configuration can have two downlink antennas, andthese two antennas can be used in various ways. In addition to using theantennas in a 2×2 MIMO scheme, the two antennas can also be used in adiversity configuration rather than MIMO configuration. Even withmultiple antennas, a particular scheme might only use one of theantennas (e.g., LTE specification's transmission mode 1, which uses asingle transmission antenna and a single receive antenna). Or, only oneantenna can be used, with various different multiplexing, precodingmethods etc.

The MIMO technique uses a commonly known notation (M×N) to representMIMO configuration in terms number of transmit (M) and receive antennas(N) on one end of the transmission system. The common MIMOconfigurations used for various technologies are: (2×1), (1×2), (2×2),(4×2), (8×2) and (2×4), (4×4), (8×4). The configurations represented by(2×1) and (1×2) are special cases of MIMO known as transmit diversity(or spatial diversity) and receive diversity. In addition to transmitdiversity (or spatial diversity) and receive diversity, other techniquessuch as spatial multiplexing (comprising both open-loop andclosed-loop), beamforming, and codebook-based precoding can also be usedto address issues such as efficiency, interference, and range.

Referring now to FIG. 11 , illustrated is a schematic block diagram ofan example end-user device such as a user equipment) that can be amobile device 1100 capable of connecting to a network in accordance withsome embodiments described herein. Although a mobile handset 1100 isillustrated herein, it will be understood that other devices can be amobile device, and that the mobile handset 1100 is merely illustrated toprovide context for the embodiments of the various embodiments describedherein. The following discussion is intended to provide a brief, generaldescription of an example of a suitable environment 1100 in which thevarious embodiments can be implemented. While the description includes ageneral context of computer-executable instructions embodied on amachine-readable storage medium, those skilled in the art will recognizethat the various embodiments also can be implemented in combination withother program modules and/or as a combination of hardware and software.

Generally, applications (e.g., program modules) can include routines,programs, components, data structures, etc., that perform particulartasks or implement particular abstract data types. Moreover, thoseskilled in the art will appreciate that the methods described herein canbe practiced with other system configurations, includingsingle-processor or multiprocessor systems, minicomputers, mainframecomputers, as well as personal computers, hand-held computing devices,microprocessor-based or programmable consumer electronics, and the like,each of which can be operatively coupled to one or more associateddevices.

A computing device can typically include a variety of machine-readablemedia. Machine-readable media can be any available media that can beaccessed by the computer and includes both volatile and non-volatilemedia, removable and non-removable media. By way of example and notlimitation, computer-readable media can comprise computer storage mediaand communication media. Computer storage media can include volatileand/or non-volatile media, removable and/or non-removable mediaimplemented in any method or technology for storage of information, suchas computer-readable instructions, data structures, program modules orother data. Computer storage media can include, but is not limited to,RAM, ROM, EEPROM, flash memory or other memory technology, CD ROM,digital video disk (DVD) or other optical disk storage, magneticcassettes, magnetic tape, magnetic disk storage or other magneticstorage devices, or any other medium which can be used to store thedesired information and which can be accessed by the computer.

Communication media typically embodies computer-readable instructions,data structures, program modules or other data in a modulated datasignal such as a carrier wave or other transport mechanism, and includesany information delivery media. The term “modulated data signal” means asignal that has one or more of its characteristics set or changed insuch a manner as to encode information in the signal. By way of example,and not limitation, communication media includes wired media such as awired network or direct-wired connection, and wireless media such asacoustic, RF, infrared and other wireless media. Combinations of the anyof the above should also be included within the scope ofcomputer-readable media.

The handset 1100 includes a processor 1102 for controlling andprocessing all onboard operations and functions. A memory 1104interfaces to the processor 1102 for storage of data and one or moreapplications 1106 (e.g., a video player software, user feedbackcomponent software, etc.). Other applications can include voicerecognition of predetermined voice commands that facilitate initiationof the user feedback signals. The applications 1106 can be stored in thememory 1104 and/or in a firmware 1108, and executed by the processor1102 from either or both the memory 1104 or/and the firmware 1108. Thefirmware 1108 can also store startup code for execution in initializingthe handset 1100. A communications component 1110 interfaces to theprocessor 1102 to facilitate wired/wireless communication with externalsystems, e.g., cellular networks, VoIP networks, and so on. Here, thecommunications component 1110 can also include a suitable cellulartransceiver 1111 (e.g., a GSM transceiver) and/or an unlicensedtransceiver 1113 (e.g., Wi-Fi, WiMax) for corresponding signalcommunications. The handset 1100 can be a device such as a cellulartelephone, a PDA with mobile communications capabilities, andmessaging-centric devices. The communications component 1110 alsofacilitates communications reception from terrestrial radio networks(e.g., broadcast), digital satellite radio networks, and Internet-basedradio services networks.

The handset 1100 includes a display 1112 for displaying text, images,video, telephony functions (e.g., a Caller ID function), setupfunctions, and for user input. For example, the display 1112 can also bereferred to as a “screen” that can accommodate the presentation ofmultimedia content (e.g., music metadata, messages, wallpaper, graphics,etc.). The display 1112 can also display videos and can facilitate thegeneration, editing and sharing of video quotes. A serial I/O interface1114 is provided in communication with the processor 1102 to facilitatewired and/or wireless serial communications (e.g., USB, and/or IEEE1394) through a hardwire connection, and other serial input devices(e.g., a keyboard, keypad, and mouse). This supports updating andtroubleshooting the handset 1100, for example. Audio capabilities areprovided with an audio I/O component 1116, which can include a speakerfor the output of audio signals related to, for example, indication thatthe user pressed the proper key or key combination to initiate the userfeedback signal. The audio I/O component 1116 also facilitates the inputof audio signals through a microphone to record data and/or telephonyvoice data, and for inputting voice signals for telephone conversations.

The handset 1100 can include a slot interface 1118 for accommodating aSIC (Subscriber Identity Component) in the form factor of a cardSubscriber Identity Module (SIM) or universal SIM 1120, and interfacingthe SIM card 1120 with the processor 1102. However, it is to beappreciated that the SIM card 1120 can be manufactured into the handset1100, and updated by downloading data and software.

The handset 1100 can process IP data traffic through the communicationcomponent 1110 to accommodate IP traffic from an IP network such as, forexample, the Internet, a corporate intranet, a home network, a personarea network, etc., through an ISP or broadband cable provider. Thus,VoIP traffic can be utilized by the handset 800 and IP-based multimediacontent can be received in either an encoded or decoded format.

A video processing component 1122 (e.g., a camera) can be provided fordecoding encoded multimedia content. The video processing component 1122can aid in facilitating the generation, editing and sharing of videoquotes. The handset 1100 also includes a power source 1124 in the formof batteries and/or an AC power subsystem, which power source 1124 caninterface to an external power system or charging equipment (not shown)by a power I/O component 1126.

The handset 1100 can also include a video component 1130 for processingvideo content received and, for recording and transmitting videocontent. For example, the video component 1130 can facilitate thegeneration, editing and sharing of video quotes. A location trackingcomponent 1132 facilitates geographically locating the handset 1100. Asdescribed hereinabove, this can occur when the user initiates thefeedback signal automatically or manually. A user input component 1134facilitates the user initiating the quality feedback signal. The userinput component 1134 can also facilitate the generation, editing andsharing of video quotes. The user input component 1134 can include suchconventional input device technologies such as a keypad, keyboard,mouse, stylus pen, and/or touch screen, for example.

Referring again to the applications 1106, a hysteresis component 1136facilitates the analysis and processing of hysteresis data, which isutilized to determine when to associate with the access point. Asoftware trigger component 1138 can be provided that facilitatestriggering of the hysteresis component 1138 when the Wi-Fi transceiver1113 detects the beacon of the access point. A SIP client 1140 enablesthe handset 1100 to support SIP protocols and register the subscriberwith the SIP registrar server. The applications 1106 can also include aclient 1142 that provides at least the capability of discovery, play andstore of multimedia content, for example, music.

The handset 1100, as indicated above related to the communicationscomponent 810, includes an indoor network radio transceiver 1113 (e.g.,Wi-Fi transceiver). This function supports the indoor radio link, suchas IEEE 802.11, for the dual-mode GSM handset 1100. The handset 1100 canaccommodate at least satellite radio services through a handset that cancombine wireless voice and digital radio chipsets into a single handhelddevice.

In order to provide additional context for various embodiments describedherein, FIG. 12 and the following discussion are intended to provide abrief, general description of a suitable computing environment 1200 inwhich the various embodiments of the embodiment described herein can beimplemented. While the embodiments have been described above in thegeneral context of computer-executable instructions that can run on oneor more computers, those skilled in the art will recognize that theembodiments can be also implemented in combination with other programmodules and/or as a combination of hardware and software.

Generally, program modules include routines, programs, components, datastructures, etc., that perform particular tasks or implement particularabstract data types. Moreover, those skilled in the art will appreciatethat the various methods can be practiced with other computer systemconfigurations, including single-processor or multiprocessor computersystems, minicomputers, mainframe computers, Internet of Things (IoT)devices, distributed computing systems, as well as personal computers,hand-held computing devices, microprocessor-based or programmableconsumer electronics, and the like, each of which can be operativelycoupled to one or more associated devices.

The illustrated embodiments of the embodiments herein can be alsopracticed in distributed computing environments where certain tasks areperformed by remote processing devices that are linked through acommunications network. In a distributed computing environment, programmodules can be located in both local and remote memory storage devices.

Computing devices typically include a variety of media, which caninclude computer-readable storage media, machine-readable storage media,and/or communications media, which two terms are used herein differentlyfrom one another as follows. Computer-readable storage media ormachine-readable storage media can be any available storage media thatcan be accessed by the computer and includes both volatile andnonvolatile media, removable and non-removable media. By way of example,and not limitation, computer-readable storage media or machine-readablestorage media can be implemented in connection with any method ortechnology for storage of information such as computer-readable ormachine-readable instructions, program modules, structured data orunstructured data.

Computer-readable storage media can include, but are not limited to,random access memory (RAM), read only memory (ROM), electricallyerasable programmable read only memory (EEPROM), flash memory or othermemory technology, compact disk read only memory (CD-ROM), digitalversatile disk (DVD), Blu-ray disc (BD) or other optical disk storage,magnetic cassettes, magnetic tape, magnetic disk storage or othermagnetic storage devices, solid state drives or other solid statestorage devices, or other tangible and/or non-transitory media which canbe used to store desired information. In this regard, the terms“tangible” or “non-transitory” herein as applied to storage, memory orcomputer-readable media, are to be understood to exclude onlypropagating transitory signals per se as modifiers and do not relinquishrights to all standard storage, memory or computer-readable media thatare not only propagating transitory signals per se.

Computer-readable storage media can be accessed by one or more local orremote computing devices, e.g., via access requests, queries or otherdata retrieval protocols, for a variety of operations with respect tothe information stored by the medium.

Communications media typically embody computer-readable instructions,data structures, program modules or other structured or unstructureddata in a data signal such as a modulated data signal, e.g., a carrierwave or other transport mechanism, and includes any information deliveryor transport media. The term “modulated data signal” or signals refersto a signal that has one or more of its characteristics set or changedin such a manner as to encode information in one or more signals. By wayof example, and not limitation, communication media include wired media,such as a wired network or direct-wired connection, and wireless mediasuch as acoustic, RF, infrared and other wireless media.

With reference again to FIG. 12 , the example environment 1200 forimplementing various embodiments of the aspects described hereinincludes a computer 1202, the computer 1202 including a processing unit1204, a system memory 1206 and a system bus 1208. The system bus 1208couples system components including, but not limited to, the systemmemory 1206 to the processing unit 1204. The processing unit 1204 can beany of various commercially available processors. Dual microprocessorsand other multi-processor architectures can also be employed as theprocessing unit 1204.

The system bus 1208 can be any of several types of bus structure thatcan further interconnect to a memory bus (with or without a memorycontroller), a peripheral bus, and a local bus using any of a variety ofcommercially available bus architectures. The system memory 1206includes ROM 1210 and RAM 1212. A basic input/output system (BIOS) canbe stored in a non-volatile memory such as ROM, erasable programmableread only memory (EPROM), EEPROM, which BIOS contains the basic routinesthat help to transfer information between elements within the computer1202, such as during startup. The RAM 1212 can also include a high-speedRAM such as static RAM for caching data.

The computer 1202 further includes an internal hard disk drive (HDD)1214 (e.g., EIDE, SATA), one or more external storage devices 1216(e.g., a magnetic floppy disk drive (FDD) 1216, a memory stick or flashdrive reader, a memory card reader, etc.) and an optical disk drive 1220(e.g., which can read or write from a CD-ROM disc, a DVD, a BD, etc.).While the internal HDD 1214 is illustrated as located within thecomputer 1202, the internal HDD 1214 can also be configured for externaluse in a suitable chassis (not shown). Additionally, while not shown inenvironment 1200, a solid state drive (SSD), non-volatile memory andother storage technology could be used in addition to, or in place of,an HDD 1214, and can be internal or external. The HDD 1214, externalstorage device(s) 1216 and optical disk drive 1220 can be connected tothe system bus 1208 by an HDD interface 1224, an external storageinterface 1226 and an optical drive interface 1228, respectively. Theinterface 1224 for external drive implementations can include at leastone or both of Universal Serial Bus (USB) and Institute of Electricaland Electronics Engineers (IEEE) 1394 interface technologies. Otherexternal drive connection technologies are within contemplation of theembodiments described herein.

The drives and their associated computer-readable storage media providenonvolatile storage of data, data structures, computer-executableinstructions, and so forth. For the computer 1202, the drives andstorage media accommodate the storage of any data in a suitable digitalformat. Although the description of computer-readable storage mediaabove refers to respective types of storage devices, it should beappreciated by those skilled in the art that other types of storagemedia which are readable by a computer, whether presently existing ordeveloped in the future, could also be used in the example operatingenvironment, and further, that any such storage media can containcomputer-executable instructions for performing the methods describedherein.

A number of program modules can be stored in the drives and RAM 1212,including an operating system 1230, one or more application programs1232, other program modules 1234 and program data 1236. All or portionsof the operating system, applications, modules, and/or data can also becached in the RAM 1212. The systems and methods described herein can beimplemented utilizing various commercially available operating systemsor combinations of operating systems.

Computer 1202 can optionally comprise emulation technologies. Forexample, a hypervisor (not shown) or other intermediary can emulate ahardware environment for operating system 1230, and the emulatedhardware can optionally be different from the hardware illustrated inFIG. 12 . In such an embodiment, operating system 1230 can comprise onevirtual machine (VM) of multiple VMs hosted at computer 1202.Furthermore, operating system 1230 can provide runtime environments,such as the Java runtime environment or the .NET framework, forapplications 1232. Runtime environments are consistent executionenvironments that allow applications 1232 to run on any operating systemthat includes the runtime environment. Similarly, operating system 1230can support containers, and applications 1232 can be in the form ofcontainers, which are lightweight, standalone, executable packages ofsoftware that include, e.g., code, runtime, system tools, systemlibraries and settings for an application.

Further, computer 1202 can be enable with a security module, such as atrusted processing module (TPM). For instance, with a TPM, bootcomponents hash next in time boot components, and wait for a match ofresults to secured values, before loading a next boot component. Thisprocess can take place at any layer in the code execution stack ofcomputer 1202, e.g., applied at the application execution level or atthe operating system (OS) kernel level, thereby enabling security at anylevel of code execution.

A user can enter commands and information into the computer 1202 throughone or more wired/wireless input devices, e.g., a keyboard 1238, a touchscreen 1240, and a pointing device, such as a mouse 1242. Other inputdevices (not shown) can include a microphone, an infrared (IR) remotecontrol, a radio frequency (RF) remote control, or other remote control,a joystick, a virtual reality controller and/or virtual reality headset,a game pad, a stylus pen, an image input device, e.g., camera(s), agesture sensor input device, a vision movement sensor input device, anemotion or facial detection device, a biometric input device, e.g.,fingerprint or iris scanner, or the like. These and other input devicesare often connected to the processing unit 1204 through an input deviceinterface 1244 that can be coupled to the system bus 1208, but can beconnected by other interfaces, such as a parallel port, an IEEE 1394serial port, a game port, a USB port, an IR interface, a BLUETOOTH®interface, etc.

A monitor 1246 or other type of display device can be also connected tothe system bus 1208 via an interface, such as a video adapter 1248. Inaddition to the monitor 1246, a computer typically includes otherperipheral output devices (not shown), such as speakers, printers, etc.

The computer 1202 can operate in a networked environment using logicalconnections via wired and/or wireless communications to one or moreremote computers, such as a remote computer(s) 1250. The remotecomputer(s) 1250 can be a workstation, a server computer, a router, apersonal computer, portable computer, microprocessor-based entertainmentappliance, a peer device or other common network node, and typicallyincludes many or all of the elements described relative to the computer1202, although, for purposes of brevity, only a memory/storage device1252 is illustrated. The logical connections depicted includewired/wireless connectivity to a local area network (LAN) 1254 and/orlarger networks, e.g., a wide area network (WAN) 1256. Such LAN and WANnetworking environments are commonplace in offices and companies, andfacilitate enterprise-wide computer networks, such as intranets, all ofwhich can connect to a global communications network, e.g., theInternet.

When used in a LAN networking environment, the computer 1202 can beconnected to the local network 1254 through a wired and/or wirelesscommunication network interface or adapter 1258. The adapter 1258 canfacilitate wired or wireless communication to the LAN 1254, which canalso include a wireless access point (AP) disposed thereon forcommunicating with the adapter 1258 in a wireless mode.

When used in a WAN networking environment, the computer 1202 can includea modem 1260 or can be connected to a communications server on the WAN1256 via other means for establishing communications over the WAN 1256,such as by way of the Internet. The modem 1260, which can be internal orexternal and a wired or wireless device, can be connected to the systembus 1208 via the input device interface 1244. In a networkedenvironment, program modules depicted relative to the computer 1202 orportions thereof, can be stored in the remote memory/storage device1252. It will be appreciated that the network connections shown areexample and other means of establishing a communications link betweenthe computers can be used.

When used in either a LAN or WAN networking environment, the computer1202 can access cloud storage systems or other network-based storagesystems in addition to, or in place of, external storage devices 1216 asdescribed above. Generally, a connection between the computer 1202 and acloud storage system can be established over a LAN 1254 or WAN 1256e.g., by the adapter 1258 or modem 1260, respectively. Upon connectingthe computer 1202 to an associated cloud storage system, the externalstorage interface 1226 can, with the aid of the adapter 1258 and/ormodem 1260, manage storage provided by the cloud storage system as itwould other types of external storage. For instance, the externalstorage interface 1226 can be configured to provide access to cloudstorage sources as if those sources were physically connected to thecomputer 1202.

The computer 1202 can be operable to communicate with any wirelessdevices or entities operatively disposed in wireless communication,e.g., a printer, scanner, desktop and/or portable computer, portabledata assistant, communications satellite, any piece of equipment orlocation associated with a wirelessly detectable tag (e.g., a kiosk,news stand, store shelf, etc.), and telephone. This can include WirelessFidelity (Wi-Fi) and BLUETOOTH® wireless technologies. Thus, thecommunication can be a predefined structure as with a conventionalnetwork or simply an ad hoc communication between at least two devices.

The computer is operable to communicate with any wireless devices orentities operatively disposed in wireless communication, e.g., aprinter, scanner, desktop and/or portable computer, portable dataassistant, communications satellite, any piece of equipment or locationassociated with a wirelessly detectable tag (e.g., a kiosk, news stand,restroom), and telephone. This includes at least Wi-Fi and Bluetooth™wireless technologies. Thus, the communication can be a predefinedstructure as with a conventional network or simply an ad hoccommunication between at least two devices.

Wi-Fi, or Wireless Fidelity, allows connection to the Internet from acouch at home, a bed in a hotel room, or a conference room at work,without wires. Wi-Fi is a wireless technology similar to that used in acell phone that enables such devices, e.g., computers, to send andreceive data indoors and out; anywhere within the range of a basestation. Wi-Fi networks use radio technologies called IEEE802.11 (a, b,g, n, etc.) to provide secure, reliable, fast wireless connectivity. AWi-Fi network can be used to connect computers to each other, to theInternet, and to wired networks (which use IEEE802.3 or Ethernet). Wi-Finetworks operate in the unlicensed 2.4 and 8 GHz radio bands, at a 12Mbps (802.11b) or 84 Mbps (802.11a) data rate, for example, or withproducts that contain both bands (dual band), so the networks canprovide real-world performance similar to the basic “10 BaseT” wiredEthernet networks used in many offices.

As it employed in the subject specification, the term “processor” canrefer to substantially any computing processing unit or devicecomprising, but not limited to comprising, single-core processors;single-processors with software multithread execution capability;multi-core processors; multi-core processors with software multithreadexecution capability; multi-core processors with hardware multithreadtechnology; parallel platforms; and parallel platforms with distributedshared memory. Additionally, a processor can refer to an integratedcircuit, an application specific integrated circuit (ASIC), a digitalsignal processor (DSP), a field programmable gate array (FPGA), aprogrammable logic controller (PLC), a complex programmable logic device(CPLD), a discrete gate or transistor logic, discrete hardwarecomponents, or any combination thereof designed to perform the functionsdescribed herein. Processors can exploit nano-scale architectures suchas, but not limited to, molecular and quantum-dot based transistors,switches and gates, in order to optimize space usage or enhanceperformance of user equipment. A processor also can be implemented as acombination of computing processing units.

In the subject specification, terms such as “store,” “data store,” “datastorage,” “database,” “repository,” “queue”, and substantially any otherinformation storage component relevant to operation and functionality ofa component, refer to “memory components,” or entities embodied in a“memory” or components comprising the memory. It will be appreciatedthat the memory components described herein can be either volatilememory or nonvolatile memory, or can comprise both volatile andnonvolatile memory. In addition, memory components or memory elementscan be removable or stationary. Moreover, memory can be internal orexternal to a device or component, or removable or stationary. Memorycan comprise various types of media that are readable by a computer,such as hard-disc drives, zip drives, magnetic cassettes, flash memorycards or other types of memory cards, cartridges, or the like.

By way of illustration, and not limitation, nonvolatile memory cancomprise read only memory (ROM), programmable ROM (PROM), electricallyprogrammable ROM (EPROM), electrically erasable ROM (EEPROM), or flashmemory. Volatile memory can comprise random access memory (RAM), whichacts as external cache memory. By way of illustration and notlimitation, RAM is available in many forms such as synchronous RAM(SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rateSDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), anddirect Rambus RAM (DRRAM). Additionally, the disclosed memory componentsof systems or methods herein are intended to comprise, without beinglimited to comprising, these and any other suitable types of memory.

In particular and in regard to the various functions performed by theabove described components, devices, circuits, systems and the like, theterms (including a reference to a “means”) used to describe suchcomponents are intended to correspond, unless otherwise indicated, toany component which performs the specified function of the describedcomponent (e.g., a functional equivalent), even though not structurallyequivalent to the disclosed structure, which performs the function inthe herein illustrated example aspects of the embodiments. In thisregard, it will also be recognized that the embodiments comprise asystem as well as a computer-readable medium having computer-executableinstructions for performing the acts and/or events of the variousmethods.

Computing devices typically comprise a variety of media, which cancomprise computer-readable storage media and/or communications media,which two terms are used herein differently from one another as follows.Computer-readable storage media can be any available storage media thatcan be accessed by the computer and comprises both volatile andnonvolatile media, removable and non-removable media. By way of example,and not limitation, computer-readable storage media can be implementedin connection with any method or technology for storage of informationsuch as computer-readable instructions, program modules, structureddata, or unstructured data.

Computer-readable storage media can include, but are not limited to,random access memory (RAM), read only memory (ROM), electricallyerasable programmable read only memory (EEPROM), flash memory or othermemory technology, solid state drive (SSD) or other solid-state storagetechnology, compact disk read only memory (CD ROM), digital versatiledisk (DVD), Blu-ray disc or other optical disk storage, magneticcassettes, magnetic tape, magnetic disk storage or other magneticstorage devices or other tangible and/or non-transitory media which canbe used to store desired information.

In this regard, the terms “tangible” or “non-transitory” herein asapplied to storage, memory or computer-readable media, are to beunderstood to exclude only propagating transitory signals per se asmodifiers and do not relinquish rights to all standard storage, memoryor computer-readable media that are not only propagating transitorysignals per se. Computer-readable storage media can be accessed by oneor more local or remote computing devices, e.g., via access requests,queries or other data retrieval protocols, for a variety of operationswith respect to the information stored by the medium.

On the other hand, communications media typically embodycomputer-readable instructions, data structures, program modules orother structured or unstructured data in a data signal such as amodulated data signal, e.g., a carrier wave or other transportmechanism, and comprises any information delivery or transport media.The term “modulated data signal” or signals refers to a signal that hasone or more of its characteristics set or changed in such a manner as toencode information in one or more signals. By way of example, and notlimitation, communications media comprise wired media, such as a wirednetwork or direct-wired connection, and wireless media such as acoustic,RF, infrared and other wireless media

Further, terms like “user equipment,” “user device,” “mobile device,”“mobile,” station,” “access terminal,” “terminal,” “handset,” andsimilar terminology, generally refer to a wireless device utilized by asubscriber or user of a wireless communication network or service toreceive or convey data, control, voice, video, sound, gaming, orsubstantially any data-stream or signaling-stream. The foregoing termsare utilized interchangeably in the subject specification and relateddrawings. Likewise, the terms “access point,” “node B,” “base station,”“evolved Node B,” “cell,” “cell site,” and the like, can be utilizedinterchangeably in the subject application, and refer to a wirelessnetwork component or appliance that serves and receives data, control,voice, video, sound, gaming, or substantially any data-stream orsignaling-stream from a set of subscriber stations. Data and signalingstreams can be packetized or frame-based flows. It is noted that in thesubject specification and drawings, context or explicit distinctionprovides differentiation with respect to access points or base stationsthat serve and receive data from a mobile device in an outdoorenvironment, and access points or base stations that operate in aconfined, primarily indoor environment overlaid in an outdoor coveragearea. Data and signaling streams can be packetized or frame-based flows.

Furthermore, the terms “user,” “subscriber,” “customer,” “consumer,” andthe like are employed interchangeably throughout the subjectspecification, unless context warrants particular distinction(s) amongthe terms. It should be appreciated that such terms can refer to humanentities, associated devices, or automated components supported throughartificial intelligence (e.g., a capacity to make inference based oncomplex mathematical formalisms) which can provide simulated vision,sound recognition and so forth. In addition, the terms “wirelessnetwork” and “network” are used interchangeable in the subjectapplication, when context wherein the term is utilized warrantsdistinction for clarity purposes such distinction is made explicit.

Moreover, the word “exemplary” is used herein to mean serving as anexample, instance, or illustration. Any aspect or design describedherein as “exemplary” is not necessarily to be construed as preferred oradvantageous over other aspects or designs. Rather, use of the wordexemplary is intended to present concepts in a concrete fashion. As usedin this application, the term “or” is intended to mean an inclusive “or”rather than an exclusive “or”. That is, unless specified otherwise, orclear from context, “X employs A or B” is intended to mean any of thenatural inclusive permutations. That is, if X employs A; X employs B; orX employs both A and B, then “X employs A or B” is satisfied under anyof the foregoing instances. In addition, the articles “a” and “an” asused in this application and the appended claims should generally beconstrued to mean “one or more” unless specified otherwise or clear fromcontext to be directed to a singular form.

In addition, while a particular feature may have been disclosed withrespect to only one of several implementations, such feature may becombined with one or more other features of the other implementations asmay be desired and advantageous for any given or particular application.Furthermore, to the extent that the terms “includes” and “including” andvariants thereof are used in either the detailed description or theclaims, these terms are intended to be inclusive in a manner similar tothe term “comprising.”

The above descriptions of various embodiments of the subject disclosureand corresponding figures and what is described in the Abstract, aredescribed herein for illustrative purposes, and are not intended to beexhaustive or to limit the disclosed embodiments to the precise formsdisclosed. It is to be understood that one of ordinary skill in the artmay recognize that other embodiments having modifications, permutations,combinations, and additions can be implemented for performing the same,similar, alternative, or substitute functions of the disclosed subjectmatter, and are therefore considered within the scope of thisdisclosure. Therefore, the disclosed subject matter should not belimited to any single embodiment described herein, but rather should beconstrued in breadth and scope in accordance with the claims below.

What is claimed is:
 1. A method, comprising: facilitating, by networkequipment comprising a processor, transmitting, to a user equipment:rate matching configuration information comprising a pattern to ratematch with respect to long term evolution cell specific referencesignals, downlink demodulation reference signal configurationinformation for physical downlink shared channel symbols, and downlinkcontrol information that schedules a physical downlink shared channelsymbol of the physical downlink shared channel symbols, wherein the longterm evolution cell specific reference signals have a same subcarrierspacing as the physical downlink shared channel symbols; and in responseto determining, based on the rate matching configuration information,that the physical downlink shared channel symbol contains a long termevolution cell specific reference signal of the long term evolution cellspecific reference signals, and that the long term evolution cellspecific reference signal will cause a collision with a firstdemodulation reference signal of a pair of demodulation referencesignals configured for the physical downlink shared channel symbol andan adjacent physical downlink shared channel symbol that is subsequent,and adjacent, to the physical downlink shared channel symbol in a symbolorder, determining, by the network equipment, that the pair ofdemodulation reference signals are to be shifted to a later pair ofadjacent physical downlink shared channel symbols of the physicaldownlink shared channel symbols that is later in the symbol order thanthe physical downlink shared channel symbol, wherein the physicaldownlink shared channel symbol is a second physical downlink sharedchannel symbol.
 2. The method of claim 1, further comprising mapping, bythe network equipment, according to the downlink demodulation referencesignal configuration information and the downlink control information,the pair of demodulation reference signals to physical resources, toshift the pair of demodulation reference signals to the later pair ofadjacent physical downlink shared channel symbols.
 3. The method ofclaim 2, further comprising, facilitating, by the network equipment,transmitting the pair of demodulation reference signals to the userequipment.
 4. The method of claim 1, wherein the later pair of adjacentphysical downlink shared channel symbols starts at a third physicaldownlink shared channel symbol, and wherein the third physical downlinkshared channel symbol is directly after the second physical downlinkshared channel symbol in the symbol order.
 5. The method of claim 1,wherein the physical downlink shared channel symbols are comprisedwithin a slot.
 6. The method of claim 1, wherein the physical downlinkshared channel symbols are part of a 14 symbol subframe.
 7. The methodof claim 1, wherein the subcarrier spacing is 15 kilohertz.
 8. Networkequipment, comprising: a processor; and a memory that stores executableinstructions that, when executed by the processor, facilitateperformance of operations, comprising: sending, to an Internet of thingsdevice, a rate matching pattern to rate match with respect to long termevolution cell specific reference signals, downlink demodulationreference signal configuration information for physical downlink sharedchannel symbols, and downlink control information that schedules aphysical downlink shared channel symbol of the physical downlink sharedchannel symbols, wherein the long term evolution cell specific referencesignals have a same subcarrier spacing as the physical downlink sharedchannel symbols; and in response to determining, based on the ratematching pattern, that the physical downlink shared channel symbol iscarrying a long term evolution cell specific reference signal of thelong term evolution cell specific reference signals, and that the longterm evolution cell specific reference signal is expected to cause acollision with a first demodulation reference signal of a pair ofdemodulation reference signals configured for the physical downlinkshared channel symbol and an adjacent physical downlink shared channelsymbol that is subsequent, and adjacent, to the physical downlink sharedchannel symbol in a symbol order, determining that the pair ofdemodulation reference signals are to be shifted to a later pair ofadjacent physical downlink shared channel symbols of the physicaldownlink shared channel symbols that is later in the symbol order thanthe physical downlink shared channel symbol, wherein the physicaldownlink shared channel symbol is a second physical downlink sharedchannel symbol.
 9. The network equipment of claim 8, wherein theoperations further comprise mapping, according to the downlinkdemodulation reference signal configuration information and the downlinkcontrol information, the pair of demodulation reference signals tophysical resources, and wherein, as a result of the mapping, the pair ofdemodulation reference signals are shifted to the later pair of adjacentphysical downlink shared channel symbols.
 10. The network equipment ofclaim 9, wherein the operations further comprise sending the pair ofdemodulation reference signals to the Internet of things device.
 11. Thenetwork equipment of claim 8, wherein the later pair of adjacentphysical downlink shared channel symbols starts at a third physicaldownlink shared channel symbol, and wherein the third physical downlinkshared channel symbol is directly after the second physical downlinkshared channel symbol in the symbol order.
 12. The network equipment ofclaim 8, wherein the physical downlink shared channel symbols arecomprised within a slot.
 13. The network equipment of claim 8, whereinthe physical downlink shared channel symbols are part of a 14 symbolsubframe comprising 14 symbols that span 1 millisecond according to adefined subcarrier spacing.
 14. The network equipment of claim 8,wherein the subcarrier spacing is represented according to a frequencyof 15 kilohertz.
 15. A non-transitory machine-readable medium,comprising executable instructions that, when executed by a processor ofa base station, facilitate performance of operations, comprising:sending, to a mobile device, rate matching configuration informationcomprising a pattern to rate match with respect to long term evolutioncell specific reference signals, downlink demodulation reference signalconfiguration information for physical downlink shared channel symbols,and downlink control information that schedules a physical downlinkshared channel symbol of the physical downlink shared channel symbols,wherein the long term evolution cell specific reference signals have asame subcarrier spacing as the physical downlink shared channel symbols;and in response to determining, based on the rate matching configurationinformation, that the physical downlink shared channel symbol comprisesa long term evolution cell specific reference signal of the long termevolution cell specific reference signals, and that the long termevolution cell specific reference signal is projected to collide with afirst demodulation reference signal of a pair of demodulation referencesignals configured for the physical downlink shared channel symbol andan adjacent physical downlink shared channel symbol that is subsequent,and adjacent, to the physical downlink shared channel symbol in a symbolorder, determining that the pair of demodulation reference signals areto be shifted to a later pair of adjacent physical downlink sharedchannel symbols of the physical downlink shared channel symbols that islater in the symbol order than the physical downlink shared channelsymbol, wherein the physical downlink shared channel symbol is a secondphysical downlink shared channel symbol.
 16. The non-transitorymachine-readable medium of claim 15, wherein the operations furthercomprise mapping, according to the downlink demodulation referencesignal configuration information and the downlink control information,the pair of demodulation reference signals to physical resources, andwherein the pair of demodulation reference signals are shifted to thelater pair of adjacent physical downlink shared channel symbols.
 17. Thenon-transitory machine-readable medium of claim 16, wherein theoperations further comprise sending the pair of demodulation referencesignals to the mobile device.
 18. The non-transitory machine-readablemedium of claim 15, wherein the later pair of adjacent physical downlinkshared channel symbols starts at a third physical downlink sharedchannel symbol, and wherein the third physical downlink shared channelsymbol is directly after the second physical downlink shared channelsymbol in the symbol order.
 19. The non-transitory machine-readablemedium of claim 15, wherein the physical downlink shared channel symbolsare comprised within a new radio slot.
 20. The non-transitorymachine-readable medium of claim 15, wherein the physical downlinkshared channel symbols are represented in a 14 symbol subframecomprising 14 orthogonal frequency division multiplexing symbols.